/*
 * Copyright (C) 2012 CyberAgent
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.acenodie.acenodieopenglturorial.filter;

public class TextureRotationUtil {

	public static final float TEXTURE_NO_ROTATION[] = { 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, };

	public static final float TEXTURE_ROTATED_90[] = { 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, };
	public static final float TEXTURE_ROTATED_180[] = { 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, };
	public static final float TEXTURE_ROTATED_270[] = { 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, };

	public static final float CUBE[] = { -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f, };

	private TextureRotationUtil() {
	}

	public static float[] getRotation(final Rotation rotation, final boolean flipHorizontal,
			final boolean flipVertical) {
		float[] rotatedTex;
		switch (rotation) {
		case ROTATION_90:
			rotatedTex = TEXTURE_ROTATED_90;
			break;
		case ROTATION_180:
			rotatedTex = TEXTURE_ROTATED_180;
			break;
		case ROTATION_270:
			rotatedTex = TEXTURE_ROTATED_90;
			break;
		case NORMAL:
		default:
			rotatedTex = TEXTURE_NO_ROTATION;
			break;
		}
		if (flipHorizontal) {
			rotatedTex = new float[] { flip(rotatedTex[0]), rotatedTex[1], flip(rotatedTex[2]), rotatedTex[3],
					flip(rotatedTex[4]), rotatedTex[5], flip(rotatedTex[6]), rotatedTex[7], };
		}
		if (flipVertical) {
			rotatedTex = new float[] { rotatedTex[0], flip(rotatedTex[1]), rotatedTex[2], flip(rotatedTex[3]),
					rotatedTex[4], flip(rotatedTex[5]), rotatedTex[6], flip(rotatedTex[7]), };
		}
		return rotatedTex;
	}

	private static float flip(final float i) {
		if (i == 0.0f) {
			return 1.0f;
		}
		return 0.0f;
	}
}
